To the Senate of the United States:
I have received the resolution of the 22d instant, requesting me "to inform the Senate of the nature and extent of 'the informal communications' which took place between the American Secretary of State and the British special minister during the late negotiations in Washington City upon the subject of the claims of the United States and Great Britain to the territory west of the Rocky Mountains," and also to inform the Senate what were the reasons which prevented "any agreement upon the subject at present" and which made it "inexpedient to include that subject among the subjects of formal negotiation."
In my message to Congress at the commencement of the present session, in adverting to the territory of the United States on the Pacific Ocean north of the forty-second degree of north latitude, a part of which is claimed by Great Britain, I remarked that "in advance of the acquirement of individual rights to these lands sound policy dictates that every effort should be resorted to by the two Governments to settle their respective claims," and also stated that I should not delay to urge on Great Britain the importance of an early settlement. Measures have been already taken in pursuance of the purpose thus expressed, and under these circumstances I do not deem it consistent with the public interest to make any communication on the subject.
John Tyler, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/200637